<template>
	<view>
		<!-- 使用自定义的搜索组件 -->
		<!-- <my-search :bgColor="'pink'" :radius="3"></my-search> -->
		<my-search @click="toSearch"></my-search>
		<view class="scroll-view-container">
			<!-- 左侧的滑动区域 -->
			<scroll-view scroll-y="true" class="left-scroll-view" :style="{ height: wh + 'px'}">
				<block v-for="(item,index) in cateList" :key="index">
					<view :class="['left-scroll-view-item',index === active?'active':'']" @click="activeChanged(index)">
						{{item.cat_name}}
					</view>
				</block>
			</scroll-view>
			<!-- 右侧的滑动区域 -->
			<scroll-view scroll-y="true" :style="{ height: wh + 'px'}" :scroll-top="scrollTop">
				<view class="cate-lv2" v-for="(item2,i2) in cateLevel2" :key="i2">
					<!-- 二级分类的标题 -->
					<view class="cate-lv2-title">/{{item2.cat_name}}/</view>
					<!-- 三级分类列表 -->
					<view class="cate-lv3-list">
						<!-- 三级分类的item项 -->
						<view class="cate-lv3-item" v-for="(item3,i3) in item2.children" :key="i3" @click="toGoodsList(item3)">
							<!-- 三级分类的图片 -->
							<image :src="item3.cat_icon"></image>
							<!-- 三级分类的文本 -->
							<text>{{item3.cat_name}}</text>
						</view>
					</view>
				</view>
			</scroll-view>
		</view>
	</view>
</template>

<script>
	import badgeMix from '@/mixins/tabbar-badge.js'
	export default {
		mixins: [badgeMix],
		data() {
			return {
				wh: 0, // 当前设备可用的高度
				cateList: [], // 分类列表的数据
				active: 0, // 当前被选中项
				cateLevel2: [], // 二级分类的列表
				scrollTop: 0 // 滚动条距离顶部的距离
			}
		},
		onLoad() {
			const sysInfo = uni.getSystemInfoSync();
			// console.log(sysInfo);
			this.wh = sysInfo.windowHeight;
			this.wh = sysInfo.windowHeight - 50;
			this.getCateList();
		},
		methods: {
			// 获取分类列表的数据
			async getCateList() {
				const { data: res } = await uni.$http.get('/api/public/v1/categories');
				if(res.meta.status !== 200) return uni.$showMsg();
				this.cateList = res.message;
				console.log(this.cateList);
				// 为二级分类赋值
				this.cateLevel2 = res.message[0].children;
			},
			activeChanged(index) {
				this.active = index;
				// 重新为二级分类赋值
				this.cateLevel2 = this.cateList[index].children;
				
				this.scrollTop = this.scrollTop === 0 ? 1 : 0;
			},
			// 跳转到商品列表页面
			toGoodsList(item) {
				uni.navigateTo({
					url: '/subpkg/goods_list/goods_list?cid=' + item.cat_id
				})
			},
			toSearch() {
				uni.navigateTo({
					url: '/subpkg/search/search'
				})
			}
		}
	}
</script>

<style lang="scss">
	.scroll-view-container {
		display: flex;
		.left-scroll-view {
			width: 120px;
			.left-scroll-view-item {
				background-color: #F7F7F7;
				line-height: 60px;
				text-align: center;
				font-size: 12px;
				&.active {
					background: #FFFFFF;
					position: relative;
					&::before {
						content: '';
						display: block;
						width: 3px;
						height: 30px;
						background-color: #C00000;
						position: absolute;
						top: 50%;
						left: 0;
						transform: translateY(-50%);
					}
				}
			}
		}
	}
	.cate-lv2-title {
		font-size: 12px;
		font-weight: bold;
		text-align: center;
		padding: 15rpx 0;
	}
	.cate-lv3-list {
		display: flex;
		flex-wrap: wrap;
		.cate-lv3-item {
			display: flex;
			flex-direction: column;
			justify-content: center;
			align-items: center;
			margin-bottom: 10px;
			width: 33.33%;
			image {
				width: 60px;
				height: 60px;
			}
			text {
				font-size: 12px;
			}
		}
	}
</style>
